CHAPTER 1

Limits relating to sound broadcasting

In applying section 4.2.2 of Article 4 the following tables of distances between the broadcasting station and the nearest point on the boundary of any other administration shall be used to identify administrations whose sound broadcasting services may be considered as affected (Tables 4.1 tot 4.4).

The coordination distances of Tables 4.1 to 4.4 apply to cases where the propagation path is over land (index L), over cold sea (SC), over warm sea (SW), or in an area of super-refractivity and ducting (SS), respectively. To simplify coordination, the distances that would be adequate for the various FM sound broadcasting systems were unified by starting a single value of 54 dB (µV/m) for the nuisance field and by taking mean values for the protection ratio (39 dB for tropospheric, 47 dB for steady interference). The larger of the two distance values resulting from tropospheric and steady interference was adopted and rounded to the nearest multiple of 10 km or 5 km for coordination distances above or below 100 km, respectively.

Linear interpolation shall be used for effective radiated powers, in dBW, differing from those given in the tables and also for effective antenna heights, other than those in Tables 4.1 to 4.3. Antenna heights of 10 m or 1800 m, respectively, shall be used when the actual height is below the former or above the latter value.

For mixed paths the coordination distance.DM, shall be the sum of the pertinent fractions of the coordination distances, Di applicable to every type of propagation path involved.

where

dT is the total path length from the transmitter to the nearest point on the border of the country concerned;and

di is the total length of those parts of the path which are over land, over cold sea, over warm sea or in areas of super-refractivity as the case may be.

TABLE 4.1

Coordination distances, D1, in km. for propagation paths over land

Effective antenna height (m)

Effective radiated power | 10 | 37.5 | 75 | 150 | 300 | 600 | 1200 | 1800

dBW | W | Coordination distances (km)

55 | 300k | 520 | 520 | 530 | 540 | 560 | 600 | 630 | 67(1

50 | 100k | 460 | 460 | 470 | 490 | 510 | 540 | 580 | 610

45 | 30k | 410 | 410 | 420 | 430 | 450 | 480 | 520 | 560

40 | 10k | 350 | 350 | 370 | 380 | 400 | 430 | 470 | 500

35 | 3k | 300 | 300 | 310 | 330 | 340 | 380 | 420 | 450

30 | 1k | 250 | 250 | 260 | 270 | 290 | 320 | 360 | 400

25 | 300 | 140 | 190 | 210 | 220 | 240 | 280 | 320 | 350

20 | 100 | 70 | 140 | 160 | 180 | 190 | 230 | 270 | 300

15 | 30 | 45 | 100 | 130 | 140 | 150 | 190 | 230 | 260

10 | 10 | 35 | 65 | 90 | 100 | 120 | 150 | 190 | 220

5 | 3 | 30 | 45 | 65 | 75 | 95 | 120 | 160 | 180

0 | 1 | 20 | 35 | 50 | 60 | 80 | 100 | 140 | 150

TABLE 4.2

Coordination distances. DSC, in km. for propagation paths over cold sea

Effective antenna height (m)

Effective radiated power | 10 | 37.5 | 75 | 150 | 300 | 600 | 1200 | 1800

dBW | W | Coordination distances (km)

55 | 300k | 790 | 790 | 800 | 820 | 850 | 880 | 910 | 950

50 | 100k | 680 | 680 | 700 | 720 | 740 | 770 | 810 | 850

45 | 30k | 590 | 590 | 610 | 630 | 650 | 670 | 730 | 750

40 | 10k | 510 | 510 | 530 | 540 | 560 | 590 | 640 | 670

35 | 3k | 440 | 440 | 460 | 470 | 490 | 530 | 570 | 600

30 | 1k | 380 | 380 | 390 | 400 | 430 | 460 | 500 | 530

25 | 300 | 320 | 320 | 330 | 350 | 370 | 400 | 440 | 470

20 | 100 | 260 | 260 | 280 | 290 | 310 | 350 | 380 | 420

15 | 30 | 150 | 210 | 220 | 240 | 260 | 300 | 340 | 360

10 | 10 | 75 | 150 | 170 | 180 | 200 | 250 | 290 | 300

5 | 3 | 40 | 100 | 120 | 130 | 150 | 200 | 240 | 260

0 | 1 | 25 | 65 | 80 | 95 | 120 | 150 | 200 | 210

TABLE 4.3

Coordination distances, Dsw, in km. for propagation paths over warm sea

Effective antenna height (m)

Effective radiated power | 10 | 37.5 | 75 | 150 | 300 | 600 | 1200 | 1800

dBW | W | Coordination distances (km)

55 | 300k | 1300 | 1300 | 1300 | 1300 | 1300 | 1300 | 1300 | 1300

50 | 100k | 1300 | 1300 | 1300 | 1300 | 1300 | 1300 | 1300 | 1300

45 | 30k | 1100 | 1100 | 1130 | 1150 | 1170 | 1200 | 1230 | 1280

40 | 10k | 800 | 800 | 840 | 870 | 900 | 940 | 970 | 1010

35 | 3k | 610 | 610 | 650 | 680 | 700 | 740 | 780 | 800

30 | 1k | 490 | 490 | 520 | 550 | 560 | 600 | 650 | 670

25 | 300 | 390 | 390 | 410 | 440 | 460 | 490 | 540 | 560

20 | 100 | 310 | 310 | 330 | 360 | 370 | 400 | 440 | 480

15 | 30 | 210 | 240 | 260 | 290 | 300 | 330 | 360 | 400

10 | 10 | 85 | 170 | 200 | 220 | 240 | 270 | 300 | 340

5 | 3 | 40 | 110 | 140 | 160 | 190 | 220 | 250 | 290

0 | 1 | 25 | 70 | 90 | 120 | 140 | 170 | 200 | 240

TABLE 4.4

Coordination distances, Dss, in km. for propagation paths in areas of superrefractivity

Effective radiated power | Coordination distances

dBW | W | Dss(km)1)

55 | 300k | 1480

50 | 100k | 1400

-45 | 30k | 1320

40 | 10k | 1230

35 | 3k | 1150

30 | 1k | 1070

25 | 300 | 980

20 | 100 | 900

15 | 30 | 820

10 | 10 | 730

5 | 3 | 650

0 | 1 | 560

1) Independent of effective antenna height.

CHAPTER 2

Limits relating to television

In applying section 4.2.2 of Article 4, the following tables of distances between the sound broadcasting station and the nearest point on the boundary of any other administration shall be used to identify administrations whose TV broadcasting services operating in accordance with the Regional Agreement (Stockholm, 1961) may be considered as affected (Tables 4.5 to 4.8).

The coordination distances in Tables 4.5 to 4.7 shall be used to ensure compatibility with television stations in countries using the band 87.5-100 MHz for television in accordance with the Regional Agreement (Stockholm, 1961). The tables apply to propagation paths which are fully overland or oversea (cold or warm). They are based on a nuisance field of 52 dB (μV/m) obtained by interpolation between values given for the bands 41-68 MHz and 174-223 MHz in the "Technical Data used by the European VHF/UHF Broadcasting Conference (Stockholm, 1961)" (part 4, section 4.2) and a protection ratio of 50 dB for tropospheric interference in accordance with Figure 2.9, in Chapter 5 of Annex 2. The coordination distances so obtained were rounded to the nearest multiple of 10 km or 5 km, respectively, for coordination distances above or below 100 km.

Coordination distances for steady interference are included in Tables 4.5 to 4.7 when they exceed those for tropospheric interference. They were derived from Figures 2.1 and 2.2 of Annex 2, adopting protection ratio values 10dB above those for tropospheric interference.

The corrections given in Table 4.8 take account of the fact that the protection ratio is a function of the frequency difference between the interfering signal and the wanted television signal. To account for this effect, the effective radiated power, in dBW, shall be reduced by this correction before the coordination distance is determined. A value of 0dB shall be used when the corrected effective radiated power, in dBW, is negative.

Linear interpolation shall be used for effective radiated powers, in dBW, differing from those given in the tables and also for effective antenna heights (m) other than those in Tables 4.1 to 4.3. Antenna heights of 10 m or 1800 m, respectively, shall be used when the actual height is below the former or above the latter value.

For mixed paths the coordination distance, DM, shall be the sum of the pertinent fractions of the coordination distances, Di, applicable to every type of propagation path involved.

where

dT is the total path length from the transmitter to the nearest point on the border of the country concerned;and

di is the total length of those parts of the path which are over land, over cold sea, over warm sea as the case may be.

TABLE 4.5

Coordination distances, D1,,in km. for propagation paths overland

Effective antenna height (m)

Effective radiated power | 10 | 37,5 | 75 | 150 | 300 | 600 | 1200 | 1800

dBW | w | Coordination distances (km)

55 | 300 k | 660 | 660 | 670 | 690 | 710 | 740 | 780 | 810